package com.caineng.zhaobiao.zbapi.utils;

import java.security.MessageDigest;

/**
 * 此类生成MD5加密字符串
 * 如果引入了hutool工具包,则生成的md5是一致的,不需要使用该类
 * MD5.create().digestHex("newability2021")
 * 9abd59dc8f6dfada97a1656017ee564e
 * 9abd59dc8f6dfada97a1656017ee564e
 *
 */
public class MD5Util {

    private static String byteArrayToHexString(byte[] b) {
        StringBuffer resultSb = new StringBuffer();
        for (int i = 0; i < b.length; i++) {
            resultSb.append(byteToHexString(b[i]));
        }
        return resultSb.toString();
    }

    private static String byteToHexString(byte b) {
        int n = b;
        if (n < 0)
            n += 256;
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }

    public static String MD5Encode(String origin, String charsetname) {
        String resultString = null;
        try {
            resultString = origin;
            MessageDigest md = MessageDigest.getInstance("MD5");
            if (charsetname == null || "".equals(charsetname))
                resultString = byteArrayToHexString(md.digest(resultString
                        .getBytes()));
            else
                resultString = byteArrayToHexString(md.digest(resultString
                        .getBytes(charsetname)));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return resultString;
    }

    public static String encode(String data) {
        return MD5Encode(data, "UTF-8");
    }

    private static final String[] hexDigits = {"0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};

    public static void main(String[] args) {
        System.out.println(encode("newability2021"));
    }
}
